no. No other data provider (and not even Meteoblue) can provide the data needed. A radar that complicated needs the 3D information of the weather generated within the MSFS engine (based on various data sources like Meteoblue, metar injection etc).
It doesn’t matter that it’s raining in a certain area according to whatever weather provider’s data. It only matters where it’s raining within the sim. Otherwise we would soon have countless of people complaining that the radar was showing rain, but the sim didn’t show rain.
The 3D weather in the sim is simply not available in an API (which would have to be coded/built by Asobo, because it would need data from within Asobo’s weather engine).
Why they didn’t make this new API, we don’t know. Might be due to licencing, might be a simple cost/benefit issue, or them simply having other priorities currently.